// Copyright 2021 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// A simple onMessage listener we can send a "ping" message to and get a "pong"
// message back.
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  const response =
      request == 'ping' ? 'pong' : 'Unexpected message: ${request}';
  sendResponse(response);
});
